Utility Contractor

MAY-JUN 2018

As the official magazine of NUCA, Utility Contractor presents the latest information affecting every aspect of the utility construction industry, including technological advancements, safety issues, legislative developments and instructional advice.

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42 Utility Contractor | May/June 2018 [EDITOR'S NOTE: In each issue, Utility Contractor will profile the projects of NUCA's Top Job Competition winners. These projects highlight NUCA members' best and most innovative work that keep our country's utility networks operating at peak performance. For information about entering your projects in the competition, visit nuca.com/topjobs .] 2017 Overall Winner St. Johns River Power Park Blowdown Piping Replacement S t. Johns River Power Park (SJRPP) consists of two pulverized bituminous coal-fired steam electric gen- erating units (SJRPP 1 and 2), interconnected with the JEA (Jacksonville Electric Authority) trans- mission system. Both units are provided with natural draft cooling towers that maintain their proper water chemistry by controlled blowdown from the respective cooling tower basins. The blowdown streams from each of the two cooling tow- ers are combined into one common underground blow- down pipe that runs from the cooling towers at SJRPP to the waterfront area of the adjacent JEA Northside Generat- ing Station (NGS). Currently, the NGS waterfront portion of the existing 42-in. diameter fiberglass reinforced pipe (FRP) cooling tower blowdown line is located on top of the outer walls of the makeup water intake structure and the south wall of the NGS circulating water discharge structure. The structure, however, was in need of repair. It was nec- essary for the existing 42-in. diameter blowdown line to be relocated in order for the structural repairs to be made. In order to maintain plant operation, it was necessary to install a new pipe section approximately 720 ft in length to replace a portion of the existing cooling tower blowdown line. The preferred routing for the new pipe section was to run the new section of 42-in. FRP piping along the north side of the NGS discharge structure, which is a sheet pile wall with concrete cap. The new pipe section then terminated near the NGS Unit 1 discharge flume. To complicate matters, the project had to be completed with an accelerated schedule for environmental reasons. With man-

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